摘要
基于Yb3+抽运动力学,结合光线追迹的方法,建立了抽运过程中的放大自发辐射模型,得到激光介质中三维含时储能分布.将速率方程理论和角谱传播理论结合,对谐振腔内调Q脉冲的形成、传播过程进行建模计算,得到激光脉冲的时间-空间分布和光束质量因子变化规律.同时进行了激光二极管抽运重频Yb:YAG片状激光器电光调Q实验,并与模拟计算的结果进行了对比校核,印证了计算模型的正确性.这为主动调Q固体激光器的设计提供了参考.
Based on the energy-level structure of quasi-three-level Yb ion, an amplified spontaneous emission model in pumping process is set up. The stored energy density distribution and the energy that can be extracted in Yb:YAG crystal are calculated. Our calculation, which is based on the laser rate equations and the theory of anglular spectrum propagation, can simulate time- resolved evolution of the spatial intensity distribution and M2 factor of the laser pulses. At the same time, an experiment in laser diode-pumped Q-switched rep-rated Yb:YAG disk laser was performed. This model was proved to be correct by comparing the results of the experiment and calculation, which will be helpful in designing active Q-switched solid laser.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第8期5798-5804,共7页
Acta Physica Sinica